Printing telegraph transmitting mechanism



1940' K. R. SCHNEIDER arm. ,22 98 PRINTING TELEGRAPH TRANSMITTING MECHANISM Origipal FiI L ed Dec. 2, 1936 ,2 Sfieets-Sheetl ATTORNEY Nov. 5, 1940.- S9HNEDER ETAL 2,220,498

' I riiiNTI G TELEGRAPH TRANSMITTING MECHANISM OriginaIFiled Dec. 2, 1956 '2 She ets-Sheet 2 ATTORNEY zwil Patented Nov. 5, 1940 t UNITED STATES PATENT OFFICE PRINTING TELEGRAPH TRANSMITTING MECHANISM Kurt R- Schneider and Clyde J. Fitch, Endicott,

N. Y., assignors to International Business Machines CorporationrNcw York, N. Y., a, corporation of New York Original application December 2, 1936, Serial No. 113,798, now Patent No. 2,161,564 dated June 6, 1939, Divided and this application November 13, 1937; Serial No. 174,293

3 Claims. (Cl. 17881) T ve t relates Printing fl p in the accompanying drawings whether within or t s i mechanisms a d more Particularly without the scope of the appended claims and irto power p t d t l pr t s comprising i direspective of other specific statements as to the Vidual Power Opera-ted units to initiate the scope of the invention contained herein.

5 trol or character signals impressed upon the In the drawings: 6 transmission medium. Fig. 1 is a sectional view of the power oper- An object of the present invention is to proated recording unit. vide novel means associated with the power op- Fig. 21s an exploded view of the power operated eratecl units of known construction to control sigcam unit. Certain structural details are exag- 10 no.1 initiating members. gerated in this view to show clearly the normal 10 The power operated units referred to each composition of certain of the operating elements. prise a cam supported in a pivoted bell crank Fig. 3 is a detail view showing the relationship member, the said cam adapted to cooperate with of the bell crank member and the control extena constantly rotating roller. The engagement of sion member.

5 the cams with the roller being controlled selec- Fig. 4 is a detail view showing the signal contively by character keys. It has been suggested trol members associated with the cam unit exherebefore, when the power operated recording tension members. unit is employed in printing telegraph systems, to Fig. 5 is a detail view showing the signal concontrol the transmitting contact members ditrol members in anoperated position.

rectly by cams as they are rotated by the cooper- For illustrative purposes, this invention is ating roller. Other suggestions comprise proshown as embodying a well known type of reviding extension members protruding at right cording unit, which may be similar in construcangles from the bell crank members supporting tion to the Electromatic typewriter, shown and the cams so that, when the cams are effective to described in detail in U. S. Patent No. 1,777,055, swing the bell crank members, signal transmitting and hence requires only the following brief demembers are operated by the said extension memscription. I bers. Referring to the drawings and particularly to In certain applications it has been found that Fi 1, wel kn wn a s a p v d d for uthe suggestions just set forth are unsuitable to atins th typ ars 6, mp i a c sta t y control the signal transmission members as derotating ro e Cooperating With a Series Of sired. The present invention contemplates proindividual D units ac co prising a cam viding extension members along'the major axis of t engagement of t e m h t e o r the bell crank members which extend beyond th being controlled selectively by thecharacter key pivotal axis of the supported cams and engage a s 35 signal transmitting control members which may y Suitable means ay e P o d t o t be disposed beneath the banks of power operated the power roller, in the direction indicated by cam units and power roller, Th m nti n d sigthe arrow, which is adapted to cooperate with two nal transmitting control members may b in the rows of com units arranged in the front and rear form of contacts operated selectively and permuf t l T am ll ay be p v d d to 40 tatively by individual permutation members opbe p t On o e m of a bell crank lever l2 erated by the said extension members or the bell whi h i pivo d in he frame of the recording crank members, or the signal transmitting conunit, as indicated ge y y e e ce c rtacts may be controlled and engaged directly by acter 13, the other arm of the said bell crank the said extension members. lever is operatively connected with an arm of Another object of the present invention, therebell crank lever ll by means of link l5. Another fore, is to provide extension means along the arm of the said lever I4 is connected to the type major axis of the bell crank member supporting bars IS in a well known manner, so as to effect the revolubly mounted cam which are adapted operation of the type bars or any other suitable so to control the signal transmitting control memmeans connected to the bell crank levers upon sebers directly or indirectly. lective operation of the controlling key bars l1.

Further objects of the instant invention reside The pivoted bell crank lever I2 is operated by in any novel feature of construction or operation the associated cam ll whenever the latter enor novel combination of parts present in the emgages the driven roller; the engagement of the $6 bodiment of the invention described and shown cam with the roller is controlled by means of the associated control key bar I 1 in a manner which will now be briefly described.

Referring now to Fig. 2, the cams occupy normally the positions as shown in this figure, which represents one of the rear bank of the units. In this position the impeller-arm i8 is urged, by the associated coil spring i8, against one of the impeller-lugs 28, which at the time is in the lower position, and tends to turn the cam II in a clockwise direction. This is prevented, however, by th engagement of one of the detents 2| on the cam, with the upper stop lug 22 on the stop lever 22. If, however, the corresponding key bar is operated, the bifurcated lower end (Fig. 1) of extension arm 24 associated with one of the said key bars I] engages an arm 25 at the upper end of the stop lever 23 which is provided with an offset projection at its end which extends laterally through an opening in the bell crank lever i2. The arm 25 of the stop lever 22 is then swung rearwardly or to-the left as viewed in Fig. 1 about the pivot 28 and its lower end forwardly or to the right as viewed in this figure, thus releasing the cam, which then turns under the influence of the spring urged impellerarm l8. In doing so the upper serrated lobe of the cam is brought into engagement with the power roller, which turns in a counterclockwise direction and therefore causes a continued roll ing movement of the cam until the high point has been reached and passed. This causes the whole cam unit to swing around the pivot It so as to pull down the corresponding link and actuate one of the type bars or any other mechanism with which the cam unit may be connected.

After the high point of the cam is passed the cam loses contact with the roller, but the said impeller-arm l8 tends to continue the rotation thereof by engaging the second impeller-lug 28 of cam ll until the second detent 21 engages one of the stop lugs. Since the half rotation of the cam consumes only a small fraction of a second, it is difilcult to release the key bar within this short interval, so that it is the lower lug 28 which is first engaged, but upon the release of the key bar and the return of the stop lever 22 to normal position, this lug 28 disengages the detent, whereupon the impeller-arm rotates the cam slightly, and the said detent then engages the upper stop lug 22.

It is obvious then that depression of a key bar releases the revolubly mounted cam to engage and be actuated by the power rolle'r in turn operating the associated bell crank lever and its attached links to cause the associated mechanism such as the type bars and other operating mechanisms, to be operated. It is to be understood that an individual cam unit is provided for each type bar or other functional mechanisms associated therewith.

The action of the cam mechanism has been described with respect to one of the rear bank of cam units; in the case of those of the forward bank the operation is analogous, but the directions of movement, and the order of operation of the stop lugs, is reversed. For example, if the bifurcated arm 24a is positioned to engage the arm 25-aat the upper end of stop lever 23-0 by virtue of operation of the associated key bar,

'the said arm is positioned rearwardly or to the left as viewed in Fig. 1, and the lower end of the stop lever 23-0. is moved forwardly, that is, to the right as viewed in the said figure. This said operation is efiective to release the cam, by virtue of positioning the lower stop lug 28-a out of the path of detent 2|--a, thus permitting the spring-urged impeller arm Il-a to rotate the cam slightly in a clockwise direction to effect engagement of the lower lobe of cam i l and power roller. Upon completion of a half revolution of the cam i l, the second detent 2'I-a engages first the upper stop lug 22-a while the stop lever 22-a is in an operated position, but upon release of the associated key bar and the return of the said stop lever to normal position, this lug 22-11 disengages the said detent and the impeller-arm rotates the cam slightly so that the said detent then engages the lower stop lug 28-0, as shown in this figure. In this manner the bell crank lever l2a is rotated about the pivot it-a to operate the associated type bar or any other mechanism associated therewith. For further structural details of the cam units, reference should be made to the above mentioned patent.

Referring now to Fig. 3, it is seen that the arms of the bell crank levers l2 are extended below the pivotal axis of the cams II. This axis is indicated by the line BB and is shown to lie in the same plane as the point of rotation or axis of the power roller Ill. The extension memher is indicated by the reference character :0 for the rear cams and 30a for the front cams. It is seen that the extension armor member 28 is disposed along the major axis of the bell crank lever II, that is the major axis in the vertical plane which is indicated by the line AA. This said member 88 is extended so as to protrude below the pivotal axis of the cam II. The extension member is shown to be an integral part of the bell crank lever in the associated figures;

however, it is understood that it readily may comprise a separate member suitably secured to the bell crank members in the position as indicated in the drawings, and such variations and modifications are encompassed in the scope of the present invention. At the lower end of the extension member 88, a cam roller 3| is rotatably mounted thereon, the pivot point or axis lying in the plane indicated by the line 0-0. It is noted that this axis line or plane is parallel to the axis 1ine or plane BB but is disposed beneath the last mentioned plane so as to be clear of the cams and power roller of the recording unit.

It has been mentioned hereinabove that the present invention is applicable to teleprinter transmitting systems and that the signal transmitting control members can be operated by the extension arms 28, and that such control members may be in the form ofpermutation bars or contacts. Referring now to Figs. 4 and 5, one form of signal control mechanism will be briefly described, since the permutation bar unit to be described forms no part of the invention per se,

the brief description to follow is deemed sufficient; for further structural details, reference may be made to the copending application Serial No. 113,798, filed Dec. 2, 1936, now Patent No. 2,161,564, June 6, 1939. In the said copending application the permutation bar unit is claimedonly; however, the present invention is shown therein but not claimed in the application referred to, so that the present application represents a divisional application of the copending case.

The signal transmitting unit comprises a plurality of rotatable bars 35, all disposed in the same horizontal plane and parallel to the axis line or plane indicated by the line 0-0 in Fig. 3. The

bars are suitably mounted in end plates secured to the frame of the machine which also are adapted to support the rods 43 which act as guide and supporting rods for the selector members 31. The said selectors 31 are slidably mounted on the said rods and are adapted to be engaged by the cam rollers 3| to be positioned thereby. Each selector 31 has a plurality of equally spaced studs 38 fixed thereon, three studs on each side of the selector member and alternately positioned thereon. r

The said studs are adaptedto engage certain of the keys 36, which are suitably secured to the permutation bars 35, when the selectors 31 are displaced by the extension members 30 and cam rollers 3|. The keys 36 are arranged to extend above and below the bars 35 as shown in the said figures. The purpose of this arrangement is explained in detail in the said application referred to hereinabove and need not be repeated here. It

is sufficient to point out that the keys protruding above the bars 35 are engaged by the studs 38 disposed on the selectors 31 which are displaced or operated by the rear cam imits, and the keys extending below the said bars are engaged by the studs on the selectors displaced by the front cam units.

The keys 36 are secured to the associated bars 35 so that the displaced selectors are adapted to displace or partially rotate the said bars when the studs on the selectors engage the corresponding keys. According to the number of keys engaged by the selector studs, various and different combinations of bars 35 are rotated or displaced upon operation of the selectors 31. Fig. 5 shows one of the selector members displaced by the extension members and cam roller associated with one of the front cam units and shows that the keys secured to permutation bars numbers 2 to 5 are engaged by the selector studs to partially rotate the said bars. Suitable control or switch arms 58 are suitably disposed so as to be released by keys 50 and displaced by the associated springs from their normal position. A group of three switch arms are disposed at each end of the machine, this fact, however, is not of importance and merely a matter of choice. It is seen that the switch arms 56 associated with the permutation bars 53 numbers 2 to 5 are positioned to engage the contacts 82 instead of the normally engaged contacts 58. The contacts correspond to the printer controlled contacts in the known Baudot or combinational code systems and can obviously be included in said printing telegraph systems for control purposes in a manner well known to those skilled in the art. The description of one form of control member controlled by the extension members 30 related to controlling indirectly the signal control contacts by means of permutation bar units, however, it is obvious that groups of contacts can be so disposed as to be engaged directly by the cam rollers 3| when displaced by the controlling bell crank levers and cams. This is a matter of choice and obviously falls within the scope of the present invention.

While there has been shown and described and pointed out the fundamental novel features of the invention as applied to a single modification, it will be understood that various omissions and substitutions and changes in the form and details of the device illustrated and in its operation may be made by those skilled in the art without departing from the spirit of the invention. It is the intention therefore to be limited only as indicated by the scope of the following claims.

What is claimed is as follows:

1. A device of the character described comprising a plurality of operable key bars, individual power operated units and means for selectively controlling and operating the said units upon operation of the key bars, said units comprising a revoluble cam and supporting member therefor, an extension member disposed longitudinally of the cam supporting member and forming a part thereof, and control means adapted to be engaged by the said extension member upon operation of the said power operated units.

2. A device of the character described compris-' ing a plurality of operable key bars, a power driven roller, individual units comprising a revoluble cam and supporting member therefor and means for selectively controlling the units upon operation of the key bars sothat the cam and roller are engaged to actuate the cam and supporting member, a control member, and an extension member disposed on the said supporting member and extending below the common plane in which the axes of said camv and roller are disposed to engage the control member upon operation of the cam and supporting member.

3. A device of the character described comprising a plurality of operable key bars, individual power operated units and means for selectively controlling and operating the units upon operation of the key bars, said units comprising a member having extensions to support a revoluble cam element and a control element in two different planes, means whereby the cam element is supported in one plane and the control element in another plane, this last mentioned plane being located below the first said plane, and a plurality of slidable members disposed in a horizontal plane below the cam elements, each said member having 

